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Welcome to our megameters/second to millimeters/second (Mm/s to mm/s) conversion calculator. You can enter a value in either the megameters/second or millimeters/second input fields. For an understanding of the conversion process, we include step by step and direct conversion formulas. If you'd like to perform a different conversion, just select between the listed Speed units in the 'Select between other Speed units' tab below or use the search bar above. Tip: Use the swap button to switch from converting megameters/second to millimeters/second to millimeters/second to megameters/second.